Improvement in burglar-alarms



J. S. MACE. Enema-MAM;

PaQtented June 27. 1876.

m'ms'sis:

N PEI'ERS. PHOTO UTHOGR WASHINGTON, c, c.

JOHN S. MACE, OF OHILLIGOTHE, OHIO.

e V IMPROVEMENT IN BURGLAR-ALARMS.

Specification formingpart of LettersPatent N 0. 179,326, dated June 27,1876; application filed May 17, 1876.

To all whom it may concern Be it known that I, JOHN S. MACE, ofOhillicothe, in the county of Ross and State of Ohio, have invented anew and Improved Burglar-Alarm; and I do hereby declare that thefollowing is a full, clear, and exact description of the same, referencebeing had to the accompanying drawing, forming part of thisspecification, in which the figure is a side elevation.

My invention belongs to that class of burglar-alarms in which an alarmis sounded upon a bell by a hammer set in motion by a clockspring andspur-gear by the opening of the door or window to which it may beapplied.

The invention consists in the particular construction and arrangement ofa stop-rod pivoted to the frame-work of thedoor, so as to engage withand stop the motion of one of the wheels of the alarm mechanism, andattached below to a slide on the door-frame, which is pushed against aprojection on the door by a spring, so that when the door is opened, andthe projection removed from the end of the slide against which it abuts,the spring forces the slide out, and, by removing the upper end of thestop-rod from the wheels of the alarm mechanism, allows the latter tooperate.

The invention also consists in the particular construction of alocking-key, combined with the above mechanism, so as to prevent theprojection of the slide when turned in one position, and permit theprojection of the slide and giving of the alarm when turnedin anotherposition.

In the drawing, A represents the side of a house, and B a door hingedthereto, to which, for the sake of illustration, my devices are shownapplied. D is a bell, and C an alarm mechanism, consisting of a hammermounted upon an oscillating pallet, a spur-gear, and a spring withratchet and pawl, all contained in a frame, and of substantially thesame construction as the ordinary clock-alarm mechanism.

The alarm mechanism is connected, through a rod, E, with a slide,F,Which moves in guides a a, and is forced inwardly against aprojection, b, upon the door by means of a spring, G. The rod E isattached to a plate, 0, which is pivoted to the side of the house so asto form a lever, and its upper end is bent so as engage with the teethof one ofthe gear-wheels, and hold the wheels against the action of thespring, to prevent the giving of the alarm until the proper moment. Thespring G is attached at its upper end to the slide, and consists simplyof a twisted flat spring, which, when the door is opened and theprojection I) removed from the end of the slide, forces said slideinwardly, and, by deflecting the pivoted rod 'E, removes its upper endfrom the notches -of the wheel, and permits the coil-spring to exert itsforce upon the hammer and sound an alarm upon the bell.

When it is not desired to have the alarm sound upon the opening of thedoor, as in the day-time, a locking device must be provided to hold backthe slide F, and for this purpose I have provided a simple form of key,H, swiveling upon its shank in the casing of the door, and so arrangedthat when it is parallel with the spring G the latter-will act to forcethe slide .in and give the alarm, and when turned at right angles itbears against the spring, and operates as a stop to the movement of thespring, to prevent the projection of the slide, consequently locking thealarm.

The alarm, asthus described, is to be applied to doors and windows ofall kinds, to safes, private secretaries, 850., and, being certain inits operation, will afford a reliable protection against the attempts ofburglars and thieves by arousing the inmates.

I am aware of the fact that burglar-alarms have been constructed with aslide which, when the door is opened, is driven inwardly by a spring torelease and set in operation the alarm mechanism; but in this case theslide is held to the door-frame by a hook which passes around a pin onsaid frame, and the arrangement is such that when it is pushed oft ofthe pin it cannot be made to automatically re-engage the same by theclosing of the door, so as to stop the alarm, while with my devices theend of the slide is beveled or curved, so as to be automatically forcedback 'by the projection on the door when the latter is closed, and thuslocks the alarm, the advantages of which arrangement are that the slidedoes not, as in the case referred to, have to be locked before thedevice is wound up,

and the occupant of the house, moreover, is always apprised of thecondition of the door, the alarm sounding whenever it is open, andstopping as soon as it is closed, by reason of the automatic arrangementof the stop mechject said slide, and the door having projection b,adapted to abut against the spring-pressed slide, as and for the purposedescribed.

2. The combination, with the alarm mechanism, the spring G, slide F, androd E, of the key H, swiveling in't'he door-frame upon .its shank, andadapted to lock the slide or not-according to the position which it ismade to assume, substantially as described.

JOHN S. MACE.

Witnesses:

W. E. BUsER, AUGUST F. BUSER, Jr., R. D. MCDOUGAL.

